Which of the following, if true, casts the most serious doubt on the assertion that dementia cases are on a rapid rise in India?

A. The mechanism of reporting dementia was made mandatory in 2018.

B. Turmeric, a known antioxidant and anti-inflammatory substance that improves cognitive functions in dementia patients, is consumed in India on a large scale.

C. The increase in the cases of dementia is largely owing to the phenomenal increase in population in the last three decades.